<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>

<body>
<script>

var r = /\141/;					// 141是字母a的ASCII编码的八进制值
var s = "javascript";
var a = s.match(r); 				// 即匹配第1个字符a


</script>
</body>
</html>
